Growth of Co ultrathin films on MgO(001)

Benamara, O.; Snoeck, E.; Blon, Thomas; Respaud, Marc

doi:10.1016/j.jcrysgro.2010.02.001

Cited by 13 publications

(7 citation statements)

References 28 publications

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“…Figure 1(a) presents a large scale AFM image of an as-grown Co film on MgO (100). The film is quite flat with a root-mean-square (rms) roughness around 0.8 nm for a scanned area of 400 μm 2 , except for the presence of a number of very high islands that stick out of the surface and are probably resulting from strain relief [19]. In Fig.…”

Section: Methodsmentioning

confidence: 91%

Modification of the magnetic properties of Co films grown on MgO (100) by treatment with NaOH solution

et al. 2014

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We investigated the surface morphology and magnetic properties of Co films grown on MgO (100) substrates before and after treatment with a NaOH solution. The surface morphology evolves from a continuous film into isolated hexagonal nanodisks resulting from the formation of cobalt hydroxide. In the as-grown Co films the magnetic anisotropy behaves as a superposition of fourfold magnetocrystalline anisotropy and uniaxial magnetic anisotropy (UMA), and the magnetization reversal proceeds by two-step domain-wall motion. After the NaOH treatment the UMA is reduced and the magnetization reversal appears to be dominated by magnetization rotation. In addition, the exchange bias effect, which in the as-deposited films results from the presence of a cobalt oxide layer, disappears after the NaOH treatment, and can be reinduced by annealing the sample. The observed significant changes in the magnetic properties can be related to the disappearance and reappearance of a cobalt oxide top layer.

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Section: Methodsmentioning

confidence: 91%

Modification of the magnetic properties of Co films grown on MgO (100) by treatment with NaOH solution

et al. 2014

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“…Previ ously, it was shown that the high temperature metasta ble cubic phase β Co is formed under these deposition conditions [23] and in an ultrahigh vacuum [24,25]. The β Co films had the preferred (001) orientation and biaxial magnetic anisotropy with the constant coinciding with the first magnetocrystalline anisot ropy constant of cubic cobalt = -(5.5-6.0) × 10 5 erg/cm 3 [26][27][28] The deposition of the Pd layer was performed at a temperature of ~250°C and did not change the mag netic properties of the β Co layer.…”

Section: Solid State Synthesis Of the Copd Alloy In Epitaxial Pd/β Comentioning

confidence: 93%

Solid-state synthesis, structural and magnetic properties of CoPd films

et al. 2015

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The results of the investigation of the structural and magnetic properties of CoPd films with equi atomic composition have been presented. The films have been synthesized by vacuum annealing of polycrys talline Pd/Co and epitaxial Pd/α Co(110) and Pd/β Co(001) bilayer samples. It has been shown that, for all samples, the annealing to 400°C does not lead to the mixing of layers and the formation of compounds. A fur ther increase in the annealing temperature results in the formation of a disordered CoPd phase at the Pd/Co interface, which is fully completed after annealing at 650°C. The epitaxial relationships between the disor dered CoPd phase and the MgO (001) substrate are determined as follows: CoPd(110)〈 〉 || MgO(001)〈100〉 and CoPd(001)[100] || MgO (001)[100], which are formed in the Pd/α Co(110) and Pd/β Co(001) films, respectively. According to the calculations, the first magnetocrystalline anisotropy constants of the disordered CoPd phase for Pd/α Co(110) and Pd/β Co(001) samples have close values:= -(1.6 ± 0.4) × 10 5 erg/cm 3 . A possible mechanism of the solid state synthesis of the CoPd alloy is proposed.

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“…Prior reports on self-assembled Co dots exist, but with a rather flat shape and with a much smaller size so that facets cannot be identified and/or vortices do not form [34][35][36]. Larger dots were reported, however with no thorough magnetic characterization [37]. We first detail the growth procedure, then analyze the topography and facets of the dots, and finally examine their zero-field magnetization configuration, revealing the occurrence of a single magnetic vortex.…”

Section: Introductionmentioning

confidence: 93%

“…If one were interested in absolute values, and assuming hcp (0001) and fcc (111) planes have similar surface energies, γ 111 ≈ 2.77 J/m 2 based on calculations [40], while experiments suggest γ 111 ≈ 2.53 J/m 2 [41,42]. However here we will cautiously restrict the discussion to energies nor- [32].…”

Section: Growth and Structurementioning

confidence: 99%

Growth and micromagnetism of self-assembled epitaxial fcc(111) cobalt dots

Fruchart¹,

Masseboeuf²,

Toussaint³

et al. 2013

J. Phys.: Condens. Matter

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We developed the self-assembly of epitaxial submicrometer-sized face-centered-cubic (fcc) Co(111) dots using pulsed laser deposition. The dots display atomically-flat facets, from which the ratios of surface and interface energies for fcc Co are deduced. Zero-field magnetic structures are investigated with magnetic force and lorentz microscopies, revealing vortex-based flux-closure patterns. A good agreement is found with micromagnetic simulations.

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Growth of Co ultrathin films on MgO(001)

Cited by 13 publications

References 28 publications

Modification of the magnetic properties of Co films grown on MgO (100) by treatment with NaOH solution

Modification of the magnetic properties of Co films grown on MgO (100) by treatment with NaOH solution

Solid-state synthesis, structural and magnetic properties of CoPd films

Growth and micromagnetism of self-assembled epitaxial fcc(111) cobalt dots

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